EP3726639A1 - Vorrichtung zur abschätzung der temperatur einer wiederaufladbaren batterie und verfahren zur abschätzung der temperatur einer wiederaufladbaren batterie - Google Patents

Vorrichtung zur abschätzung der temperatur einer wiederaufladbaren batterie und verfahren zur abschätzung der temperatur einer wiederaufladbaren batterie Download PDF

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Publication number
EP3726639A1
EP3726639A1 EP18896141.1A EP18896141A EP3726639A1 EP 3726639 A1 EP3726639 A1 EP 3726639A1 EP 18896141 A EP18896141 A EP 18896141A EP 3726639 A1 EP3726639 A1 EP 3726639A1
Authority
EP
European Patent Office
Prior art keywords
chargeable battery
temperature
value
detected
current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18896141.1A
Other languages
English (en)
French (fr)
Other versions
EP3726639A4 (de
Inventor
Masashi Matsushita
Katsuhide HAMADA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Furukawa Electric Co Ltd
Furukawa Automotive Systems Inc
Original Assignee
Furukawa Electric Co Ltd
Furukawa Automotive Systems Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Furukawa Electric Co Ltd, Furukawa Automotive Systems Inc filed Critical Furukawa Electric Co Ltd
Publication of EP3726639A1 publication Critical patent/EP3726639A1/de
Publication of EP3726639A4 publication Critical patent/EP3726639A4/de
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/42—Circuits effecting compensation of thermal inertia; Circuits for predicting the stationary value of a temperature
    • G01K7/427—Temperature calculation based on spatial modeling, e.g. spatial inter- or extrapolation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/374—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with means for correcting the measurement for temperature or ageing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/04—Arrangement of batteries
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K3/00—Thermometers giving results other than momentary value of temperature
    • G01K3/02—Thermometers giving results other than momentary value of temperature giving means values; giving integrated values
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K2205/00—Application of thermometers in motors, e.g. of a vehicle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a chargeable battery temperature estimation apparatus and a chargeable battery temperature estimation method.
  • chargeable batteries In recent years, in automobiles or the like, the number of electric devices operated using electric power stored in chargeable batteries has increased. In addition, for example, more and more devices relating to safe traveling, such as an electric power steering and an electric brake, are operated with chargeable batteries. It is known that characteristics of such chargeable batteries vary depending on a temperature. For example, a capacity of a chargeable battery may drop further as the temperature lowers. Thus, when the temperature is low, startability of an engine may drop. For this reason, in consideration of safety etc., the temperature of a chargeable battery needs to be ascertained. However, the chargeable battery includes a strong acid or strong alkaline electrolytic solution having high corrosiveness, and this makes it difficult to set a temperature sensor inside the chargeable battery to detect internal temperature thereof.
  • Patent Document 1 discloses a method of estimating a chargeable battery temperature by estimating a chargeable battery temperature through performing an proportional operation and an integral operation on a difference value between a detected temperature value, which is detected using a temperature sensor that detects external temperature of a chargeable battery, and a previous estimated temperature value.
  • Patent Document 2 discloses a method of estimating a battery temperature by calculating each of chemical reaction heat and Joule heat generated due to charging and discharging currents, and calculating a sum of the chemical reaction heat and the Joule heat, then estimating a battery temperature based on the sum.
  • an internal temperature of a chargeable battery is estimated based on an amount of variation of the internal temperature due to flow of heat into or out of the chargeable battery. This means that Joule heat generation and chemical reaction heat due to charging and discharging currents, i.e., heat generation, inside the chargeable battery are not taken into consideration, and the amount of internal heat generation due to charge and discharge may be erroneous. This causes a problem whereby the internal temperature cannot be correctly estimated.
  • Patent Document 2 takes into account internal heat generation due to charging and discharging currents, however, in the technology, because chemical reaction heat and Joule heat generation due to charging and discharging currents are calculated separately before results of each calculation are added up, there may be a problem whereby a calculation load increases.
  • the present invention is made under such circumstances as described above, and has an object to provide a chargeable battery temperature estimation apparatus and a chargeable battery temperature estimation method capable of accurately estimating an internal temperature of a chargeable battery through simple calculation.
  • a chargeable battery temperature estimation apparatus estimating an internal temperature of a chargeable battery includes: a current acquiring means for acquiring a detected current value output from a current sensor configured to detect a current flowing in the chargeable battery; a calculating means for calculating a heating value on the basis of the detected current value, with the heat being generated, according to a current, inside the chargeable battery; a temperature acquiring means for acquiring a detected temperature value output from a temperature sensor configured to detect an external temperature of the chargeable battery; an estimation means for estimating the internal temperature of the chargeable battery according to a current and an external temperature, based on the heating value and the detected temperature value; and an output means for outputting the estimated internal temperature.
  • an internal temperature of a chargeable battery can be accurately estimated by simple calculation.
  • the calculating means calculates, as the heating value, a sum of heat amounts of Joule heat and chemical reaction heat generated inside the chargeable battery.
  • heat generated inside a chargeable battery can be accurately detected, and an internal temperature can be accurately estimated.
  • the estimation means calculates a difference value between the detected temperature value and the estimated temperature value previously estimated, performs a proportional operation on the difference value, performs an integral operation on an added value of the heating value and the difference value, and estimates the internal temperature by adding values obtained through the proportional operation and the integral operation.
  • an internal temperature can be accurately estimated by simple calculation.
  • the calculating means calculates the heating value by multiplying the detected current value by a predetermined coefficient ⁇ .
  • the calculating means varies values of the ⁇ according to the detected current value detected by the current sensor.
  • a heating value can be accurately estimated by simple calculation.
  • the calculating means sets different values of the ⁇ different between a case where the chargeable battery is being charged and a case where the chargeable battery is being discharged.
  • the calculating means sets a value of the ⁇ according to a detected voltage value of the chargeable battery, acquired from a voltage sensor, when the chargeable battery is being charged.
  • the calculating means sets a value of the ⁇ according to a detected voltage value of the chargeable battery, acquired from a voltage sensor, when the chargeable battery is being discharged. According to such a configuration, occurrence of errors can be further reduced.
  • the calculating means sets a value of the ⁇ according to a state of deterioration of the chargeable battery.
  • an internal temperature of a chargeable battery can be accurately estimated regardless of a state of deterioration of the chargeable battery.
  • an internal temperature of a chargeable battery can be accurately estimated through an operation in the discrete time domain.
  • the calculating means calculates the heating value only when an absolute value of the detected current value detected by the current sensor is greater than or equal to a predetermined threshold value.
  • an internal temperature of a chargeable battery can be accurately estimated, with an amount of calculation being reduced.
  • the output means estimates a temperature of the chargeable battery mounted in a vehicle and outputs the estimated temperature
  • a processor of the vehicle changes an operation state of the vehicle, based on an estimated value of a temperature output from the output means.
  • a state of a vehicle can be appropriately controlled according to a temperature of a chargeable battery.
  • a chargeable battery temperature estimation method for estimating an internal temperature of a chargeable battery includes: a current acquiring step of acquiring a detected current value output from a current sensor configured to detect a current flowing in the chargeable battery; a calculating step of calculating a heating value on the basis of the detected current value, with the heat being generated, according to a current, inside the chargeable battery; a temperature acquiring step of acquiring a detected temperature value output from a temperature sensor configured to an detect external temperature of the chargeable battery; an estimation step of estimating the internal temperature of the chargeable battery according to a current and an external temperature, based on the heating value and the detected temperature value; and an output step of outputting the estimated internal temperature.
  • an internal temperature of a chargeable battery can be accurately estimated by simple calculation.
  • an internal temperature of a chargeable battery can be accurately estimated by simple calculation.
  • a chargeable battery temperature estimation apparatus and a chargeable battery temperature estimation method capable of accurately estimating an internal temperature of a chargeable battery by simple calculation can be provided.
  • FIG. 1 is a diagram illustrating a power supply system of a vehicle having a chargeable battery temperature estimation apparatus according to an embodiment of the present invention.
  • a chargeable battery temperature estimation apparatus 1 includes main components, which are a control unit 10, a voltage sensor 11, a current sensor 12, and a temperature sensor 13, and estimates an internal temperature of a chargeable battery 14 and reports the same to a higher-level device (for example, an electric control unit (ECU)) (not illustrated).
  • ECU electric control unit
  • control unit 10 estimates an internal temperature of the chargeable battery 14 by referring to outputs from the voltage sensor 11, the current sensor 12, and the temperature sensor 13. Further, the control unit 10 detects a state of the chargeable battery 14 and controls a generated voltage of an alternator 15, thereby controlling a charge state of the chargeable battery 14. Note that the voltage sensor 11, the current sensor 12, and the temperature sensor 13 may be incorporated into the control unit 10, or may be provided outside the control unit 10.
  • the voltage sensor 11 detects a terminal voltage of the chargeable battery 14, and supplies the detected terminal voltage as a voltage detection signal to a CPU 10a via an I/F 10e.
  • the current sensor 12 detects a current flowing in the chargeable battery 14, and supplies the detected current as a current detection signal to the CPU 10a via the I/F 10e.
  • the temperature sensor 13 is a thermistor, a thermocouple, or the like, and is disposed at a position close to an electrolytic cell of the chargeable battery 14.
  • the temperature sensor 13 detects an external temperature of the chargeable battery 14, and supplies the detected external temperature as a temperature detection signal to the CPU 10a via the I/F 10e.
  • internal temperature refers to a temperature of an electrolytic solution of the chargeable battery 14.
  • external temperature refers to a temperature outside the chargeable battery 14, and refers to, for example, an ambient temperature of an environment, in which the chargeable battery 14 is disposed, or a temperature of resin constituting the electrolytic cell.
  • a temperature of an electrode terminal itself (not illustrated) of the chargeable battery 14, an ambient temperature thereof, or a temperature inside a vent plug (not illustrated) may be used as the external temperature.
  • the position to provide the temperature sensor 13 be near a part of the electrolytic cell where the electrolytic solution is filled, for example, because the electrolytic solution is the target of internal temperature estimation.
  • a position at which the temperature sensor 13 is attached may be a position as close as possible to an engine 16.
  • an ECU may control the charge state.
  • the chargeable battery 14 is a chargeable battery including an electrolytic solution, such as a lead-acid battery, a nickel-cadmium battery, or a nickel-metal hydride battery, and is charged by the alternator 15, and drives a starter motor 17 to start an engine, and moreover supplies electric power to a load 18.
  • the chargeable battery 14 is constituted of a plurality of cells connected in series.
  • the alternator 15 is driven by the engine 16, generates AC power and converts the generated AC power into DC power through a rectifier circuit, and charges the chargeable battery 14.
  • the alternator 15 is controlled by the control unit 10, and can adjust the generated voltage.
  • the engine 16 is a reciprocating engine, such as a petrol engine or a diesel engine, or a rotary engine, etc., is started by the starter motor 17, and drives drive wheels via a transmission to supply propulsive power to the vehicle.
  • the engine 16 also drives the alternator 15 to generate electric power.
  • the starter motor 17 is a DC motor, and generates a rotational force by using electric power supplied from the chargeable battery 14 to start the engine 16.
  • the load 18 is formed by an electric power steering motor, a defogger, a seat heater, an ignition coil, a car audio system, a car navigation system, or the like.
  • the load 18 runs on electric power supplied from the chargeable battery 14.
  • FIG. 2 is a diagram illustrating a detailed configuration example of the control unit 10 illustrated in FIG. 1 .
  • the control unit 10 includes a central processing unit (CPU) 10a, a read-only memory (ROM) 10b, a random access memory (RAM) 10c, a communication unit 10d, an interface (I/F) 10e, and a bus 10f.
  • the CPU 10a controls components, based on a program 10ba stored in the ROM 10b.
  • the ROM 10b is a semiconductor memory or the like, and stores, for example, the program 10ba that can be executed by the CPU 10a.
  • the RAM 10c is a semiconductor memory or the like, and stores data, generated at a time of execution of the program 10ba, and data 10ca (described later) such as a table.
  • the communication unit 10d performs communication with an ECU serving as a higher-level device, for example, and reports detected information or control information to the higher-level device.
  • the I/F 10e imports signals supplied from the voltage sensor 11, the current sensor 12, and the temperature sensor 13 by converting the signals into digital signals, and supplies a driving current to the alternator 15 and the starter motor 17, for example, to control the same.
  • the bus 10f is a group of signal lines for connecting the CPU 10a, the ROM 10b, the RAM 10c, the communication unit 10d, and the I/F 10e to one another, and for enabling these to exchange information with one another.
  • a digital signal processor (DSP), a field programmable gate array (FPGA), or an application specified integrated circuit (ASIC) may be used in place of the CPU 10a.
  • FIG. 3 is a block diagram illustrating a temperature estimation algorithm implemented when the program 10ba illustrated in FIG. 2 is executed.
  • the block diagram illustrated in FIG. 3 includes an adder-subtractor circuit 31, constant multiplier circuits 32 to 34, adder circuits 35 and 37, an integrator circuit 36, and a delay circuit 38.
  • the adder-subtractor circuit 31 subtracts a previous estimated temperature value Tb(n - 1), which is output from the delay circuit 38, from a detected temperature value Ta(n), which is supplied from the temperature sensor 13, and outputs an obtained value as a difference value dT(n).
  • n represents the number of times of processing.
  • the constant multiplier circuit 32 outputs a value obtained by multiplying the difference value dT(n), which is output from the adder-subtractor circuit 31, by G_integ, i.g., an integral gain.
  • the constant multiplier circuit 33 outputs a value obtained by multiplying the difference value dT(n), which is output from the adder-subtractor circuit 31, by G_prop, i.e., a proportional gain.
  • the constant multiplier circuit 34 inputs a detected current value I detected using the current sensor 12, and outputs a value obtained by multiplying the input detected current value I by ⁇ , i.e., a coefficient.
  • the adder circuit 35 adds together the value output from the constant multiplier circuit 32 and the value output from the constant multiplier circuit 34, and outputs the same.
  • the integrator circuit 36 integrates the value output from the adder circuit 35, and outputs the same.
  • the adder circuit 37 adds the output value of the constant multiplier circuit 33 and the output value of the integrator circuit 36, and outputs an obtained value as an estimated temperature value Tb(n).
  • the delay circuit 38 delays the estimated temperature value Tb(n), which is output from the adder circuit 37, by one sample period, and outputs the same as Tb(n - 1) to the adder-subtractor circuit 31.
  • Tb n VT _ prop n + VT _ integ n
  • the program 10ba illustrated in FIG. 2 when executed, the algorithm of the block diagram illustrated in FIG. 3 is implemented, a detected temperature value output from the temperature sensor 13 is sampled in a predetermined period, and an estimated temperature value is output based on a proportional operation and an integral operation. Then, the estimated temperature value obtained as described above is supplied to an ECU (not illustrated). The ECU executes processing such as temperature correction of a state of charge (SOC), based on the supplied estimated temperature value, for example.
  • SOC state of charge
  • the adder-subtractor circuit 31 inputs a detected temperature value Ta(n) supplied from the temperature sensor 13, adds together the supplied detected temperature value Ta(n) and Tb(n - 1), which is an estimated temperature value of the immediately preceding sampling period supplied from the delay circuit 38, and outputs the same as dT(n).
  • the constant multiplier circuit 32 multiplies dT(n), which is output from the adder-subtractor circuit 31, by G_integ, i.e., an integral gain, and outputs the same.
  • the constant multiplier circuit 33 multiplies dT(n), which is output from the adder-subtractor circuit 31, by G_prop, i.e., a proportional gain, and outputs the same.
  • the constant multiplier circuit 34 multiplies a detected current value I(n), which is supplied from the current sensor 12, by ⁇ , and outputs the same.
  • ⁇ is a constant, the value of which varies according to a value of a current flowing in the chargeable battery 14 and a direction of the current. More specifically, the value of the coefficient ⁇ of the constant multiplier circuit 34 can be represented as follows.
  • fc(I) is a function, the independent variable of which is a current I, and is a function, the value of which varies according to a charging current I.
  • fd(I) is a function, the independent variable of which is a current I, and is a function, the value of which varies according to a discharging current I.
  • fc(I) and fd(I) can be calculated through actual measurement.
  • the dependence of fc(I) and fd(I) on a current varies according to presence or absence of an insulator provided to protect the chargeable battery 14 from temperature variation, the size of the chargeable battery 14, the number of electrode plates thereof, a type thereof (a general liquid type or a sealed type), or the like.
  • the internal temperature of the chargeable battery 14 can be estimated with even higher accuracy.
  • a discharge reaction of a lead-acid battery is an endothermic reaction, and a charge reaction thereof is an exothermic reaction.
  • the functions fc(I) and fd(I) suitable respectively for individual cases of charge and discharge, the internal temperature can be calculated with high accuracy.
  • fc(I) and fd(I) also vary according to a deterioration state of the chargeable battery 14. For example, when deterioration of a lead-acid battery progresses, the internal resistance increases, and thus Joule heat (I 2 ⁇ R) increases. For this reason, by correcting fc(I) and fd(I) in accordance with a deterioration state of the chargeable battery 14, the internal temperature can be accurately estimated, regardless of the deterioration state.
  • the adder circuit 35 adds together the output value of the constant multiplier circuit 34 and the output value of the constant multiplier circuit 32, and supplies the same to the integrator circuit 36.
  • the integrator circuit 36 integrates the output value of the adder circuit 35, and supplies the same to the adder circuit 37.
  • the adder circuit 37 adds together the output value of the integrator circuit 36 and the output value of the constant multiplier circuit 33, and outputs the same as an estimated temperature value Tb(n) relating to the internal temperature of the chargeable battery 14.
  • the delay circuit 38 delays the output value of the adder circuit 37 by one sampling period, and supplies the same to the adder-subtractor circuit 31.
  • the internal temperature of the chargeable battery 14 can be estimated, based on a detected current value acquired by the current sensor 12 and a detected temperature value acquired by the temperature sensor 13.
  • FIG. 4 is a graph showing a comparison between estimated results of internal temperature according to the present embodiment and estimated results of internal temperature according to technology disclosed in Patent Document 1.
  • the vertical axis of FIG. 4 represents temperature [°C], and the horizontal axis represents time [h].
  • the solid line indicates actually measured results
  • the densely dashed line indicates estimated results of internal temperature according to the present embodiment
  • the loosely dashed line indicates estimated results of internal temperature according to technology disclosed in Patent Document 1.
  • the chargeable battery 14 is repeatedly charged and discharged with charging and discharging currents of 50 A alternately at intervals of 30 seconds for 30 minutes.
  • the chargeable battery 14 is repeatedly charged and discharged with charging and discharging currents of 20 A alternately at intervals of 30 seconds for 30 minutes. Subsequently, the charge and discharge are stopped, whereby temperature variation is actually measured.
  • Comparison between the solid line and the loosely dashed line according to Patent Document 1 in FIG. 4 shows that there is a great gap between the two lines. In contrast, comparison between the solid line and the densely dashed line shows that the two lines are very close to each other. As shown in FIG. 4 , in the present embodiment, with heat generation and heat absorption occurring due to charge and discharge being taken into consideration, estimation accuracy of the present embodiment is enhanced more than that of technology disclosed in Patent Document 1.
  • the constant multiplier circuit 34 and the adder circuit 35 illustrated in FIG. 3 are provided such that a value according to a detected current value detected by the current sensor 12 is added, therefore, as shown in FIG. 4 , internal temperature can be accurately estimated even when charge and discharge are being performed.
  • Step S10 the CPU 10a acquires a detected current value I detected by the current sensor 12, via the I/F 10e.
  • the detected current value may be defined as being positive when the chargeable battery 14 is being charged, and the detected current value may be defined as being negative when the chargeable battery 14 is being discharged.
  • the reverse definition may be used.
  • Step S11 the CPU 10a calculates an absolute value Ia of the detected current value I acquired in Step S10. For example, when the current acquired in Step S10 is -25 A, 25 A is obtained.
  • Step S12 the CPU 10a compares the absolute value Ia of the detected current value calculated in Step S11 and a predetermined threshold value Th.
  • the CPU 10a determines that Ia > Th (Step S12: Y)
  • the process proceeds to Step S13.
  • Step S12: N the process proceeds to Step S19. For example, when Ia > Th (1 A), the process proceeds to Step S13.
  • Step S13 the CPU 10a determines whether or not the chargeable battery 14 is being discharged.
  • Step S13: Y the process proceeds to Step S14. Otherwise (Step S13: N), the process proceeds to Step S15. For example, when the detected current value acquired in FIG. 9 is negative, the CPU 10a can determine that the chargeable battery 14 is being discharged.
  • Step S14 the CPU 10a sets ⁇ shown in expression (5) for the constant multiplier circuit 34.
  • Step S15 the CPU 10a sets ⁇ shown in expression (4) for the constant multiplier circuit 34.
  • Step S16 whether or not the chargeable battery 14 is deteriorated is determined.
  • Step S16: Y determination is made that the chargeable battery 14 is deteriorated
  • Step S17 determination is made that the chargeable battery 14 is deteriorated
  • Step S16: N the process proceeds to Step S18.
  • a voltage and a current used when the engine 16 is started are measured by the voltage sensor 11 and the current sensor 12, respectively.
  • a state of health (SOH) which indicates deterioration of the chargeable battery 14, is calculated.
  • SOH state of health
  • Step S17 the CPU 10a corrects the value of ⁇ in accordance with the deterioration state of the chargeable battery 14. More specifically, when the chargeable battery 14 is significantly deteriorated, the internal resistance increases and thus the amount of generated Joule heat increases. For this reason, ⁇ for the case of charge and ⁇ for the case of discharge described above are corrected in accordance with a degree of deterioration.
  • Step S18 the CPU 10a executes temperature estimation processing that includes charge and discharge correction. More specifically, the CPU 10a executes processing of estimating the internal temperature of the chargeable battery 14 in consideration of the output from the constant multiplier circuit 34 in FIG. 3 .
  • Step S19 the CPU 10a executes internal temperature estimation processing that does not include charge and discharge correction. More specifically, the CPU 10a executes processing of estimating the internal temperature of the chargeable battery 14 without consideration of the output from the constant multiplier circuit 34 in FIG. 3 (with the constant multiplier circuit 34 being stopped).
  • the internal temperature is estimated in consideration of Joule heat and chemical reaction heat generated due to charge and discharge of the chargeable battery 14. Therefore, the internal temperature can be accurately estimated.
  • ⁇ is corrected in consideration of deterioration of the chargeable battery 14. Therefore, the internal temperature can be accurately estimated regardless of the state of deterioration of the chargeable battery 14.
  • charge and discharge correction is performed by using expression (4) and expression (5) described above.
  • a table showing correspondence between the detected current value and the value of ⁇ may be stored in the RAM 10c, for example, and charge and discharge correction may be performed with reference to the table.
  • the same threshold value Th is used for both charge and discharge.
  • different threshold values may be used for charge and discharge respectively.
  • determination may be made using a threshold value Th1
  • determination may be made using a threshold value Th2 (Th1 ⁇ Th2).
  • Th1 ⁇ Th2 the threshold value
  • the threshold values may be set to satisfy Th2 ⁇ Th1.
  • ⁇ is corrected when the chargeable battery 14 is deteriorated to a predetermined degree or more.
  • expression (6) and expression (7) may be used, which are the same as expression (4) and expression (5), respectively, except the SOH is taken into consideration.
  • a table may be used instead of a mathematical expression.
  • the proportional gain and the integral gain of the constant multiplier circuits 32 and 33 illustrated in FIG. 3 may be set according to an operation state of a vehicle.
  • each of the proportional gain and the integral gain of the constant multiplier circuits 32 and 33 is divided into two types of gains as illustrated in FIG. 6 .
  • the two types of gains are, specifically, a first proportional gain and a first integral gain each having a larger value, and a second proportional gain and a second integral gain each having a smaller value.
  • the two types of gains are set according to an operation state of the vehicle.
  • the first proportional gain and the first integral gain are set for the constant multiplier circuits 32 and 33, whereas when the engine 16 is in a stopped state, the second proportional gain and the second integral gain are set for the constant multiplier circuits 32 and 33.
  • the gains are changed according to a state of the vehicle as described above because a tendency of temperature variation of the chargeable battery 14 varies according to an operation state of the vehicle, in particular, an operation state of the engine 16.
  • the temperature variation of the chargeable battery 14 is mainly caused by heat generated due to operation of the engine 16 and transferred to the chargeable battery 14 through thermal radiation, or transferred to the chargeable battery 14 by air generated due to traveling of the vehicle or air generated by a radiator fan, for example.
  • the engine 16 is disposed in an engine compartment, where the chargeable battery 14 is disposed.
  • the engine 16 generates a large amount of heat continuously during operation of the engine 16, and thus the temperature rises sharply.
  • the heat of the engine 16 itself and the heat remaining in the engine compartment are cooled through natural cooling, and thus the temperature gently falls. This means that the rate of temperature variation differs between a case when temperature rises and a case when temperature falls. For this reason, in the present embodiment, temperature is estimated separately for these cases.
  • the voltage of the chargeable battery 14 lowers when the SOC of the chargeable battery 14 is low, or when the chargeable battery 14 is significantly deteriorated, or moreover when the temperature thereof is low.
  • the internal resistance may increase more than usual.
  • the internal resistance includes conductor resistance, liquid resistance, anode reaction resistance, cathode reaction resistance, and diffusion resistance.
  • the cathode reaction resistance and the diffusion resistance may cause large errors when the chargeable battery 14 is discharged while the voltage thereof is low, as caused by increased values of these two resistances.
  • ⁇ is corrected when the voltage of the chargeable battery 14 is less than a predetermined threshold value while the chargeable battery 14 is discharged.
  • Step S30 to Step S32 are added, which differ from FIG. 5 .
  • Other steps are same as those of FIG. 5 , and thus Step S30 to Step S32 will be described below.
  • Step S30 the CPU 10a acquires a voltage of the chargeable battery 14. More specifically, the CPU 10a acquires a terminal voltage of the chargeable battery 14 from the voltage sensor 11, via the I/F 10e.
  • Step S31 the CPU 10a compares a voltage V acquired in Step S30 and a threshold value Th1.
  • V ⁇ Th1 is satisfied (Step S31: Y)
  • Step S32 the process proceeds to Step S32.
  • Step S31: N the process proceeds to Step S16. For example, if the voltage V is less than the threshold value Th1 (for example, 10 V), it is determined that the process follows Y, and the process proceeds to Step S32.
  • Th1 for example, 10 V
  • Step S32 the CPU 10a corrects ⁇ . More specifically, for example, ⁇ is corrected based on following expression (8).
  • fdl(I, V, SOH) is a function, the independent variables of which are current I, V, and SOH, and is a function, the value of which varies according to a discharging current I, a voltage V, and a state of health (SOH). Note that, in comparison with expression (7), fdl(I, V, SOH) > fd(I, SOH) is satisfied.
  • ⁇ fdl I V SOH
  • ⁇ is corrected according to expression (8) when the terminal voltage V is less than the predetermined threshold value Th1 while the chargeable battery 14 is being discharged.
  • This correction allows ⁇ to cover the increase of the cathode reaction resistance and the diffusion resistance. Thus, errors in estimation of temperature can be reduced.
  • ⁇ is corrected when the voltage of the chargeable battery 14 is larger than a predetermined threshold value Th2 while the chargeable battery 14 is being charged.
  • Step S50 to Step S52 are added, which differ from FIG. 5 .
  • Other steps are similar to those of FIG. 5 , and thus Step S50 to Step S52 will be described below.
  • Step S50 the CPU 10a acquires a terminal voltage V of the chargeable battery 14. More specifically, the CPU 10a acquires a terminal voltage of the chargeable battery 14 from the voltage sensor 11, via the I/F 10e.
  • Step S51 the CPU 10a compares the voltage V acquired in Step S50 and a threshold value Th2.
  • V > Th2 is satisfied (Step S51: Y)
  • Step S51: N the process proceeds to Step S16.
  • the threshold value Th2 for example, 15 V
  • Step S52 the CPU 10a corrects ⁇ . More specifically, for example, ⁇ is corrected, based on following expression (9).
  • fci(I, V, SOH) is a function, the independent variables of which are current I, V, and SOH, and is a function, the value of which varies according to a discharging current I, a voltage V, and an SOH. Note that, in comparison with expression (6), fci(I, V, SOH) > fc(I, SOH) is satisfied.
  • ⁇ fci I V SOH
  • ⁇ is corrected according to a value obtained by expression (9) when the terminal voltage V exceeds the predetermined threshold value Th2 while the chargeable battery 14 is being charged.
  • This correction allows ⁇ to cover the increase of the internal resistance due to the gasses generated in electrolysis. Thus, errors in estimation of temperature can be reduced.
  • correction of ⁇ is separately executed for charge and for discharge.
  • correction of ⁇ illustrated in FIG. 7 and FIG. 8 may be executed in the same flowchart.
  • the flowchart illustrated in FIG. 9 includes both the processing of Step S30 to Step S32 illustrated in FIG. 7 and the processing of Step S50 to Step S52 illustrated in FIG. 8 .
  • ⁇ can be corrected according to expression (8) when V ⁇ Th1 during discharge, and ⁇ can be corrected according to expression (9) when V > Th2 during charge.
  • FIG. 10 and FIG. 11 are each a graph showing actually measured results. More specifically, FIG. 10 shows measured results obtained when the processing illustrated in FIG. 5 is executed, and FIG. 11 shows actually measured results obtained when the processing illustrated in FIG. 9 is executed.
  • FIG. 10 charge and discharge as shown in FIG. 12 are repeatedly executed in a hatched rectangular area, and this FIG. 10 shows an estimated value and an actually measured value of a solution temperature.
  • one cycle of operation includes the following: Firstly, (1) discharge is executed with 48 A for 50 seconds. Next, (2) discharge is executed with 300 A for one second. Lastly, (3) charge is executed with 60 A for 50 seconds. The cycle of (1) to (3) is repeatedly executed. Note that the charge of (3) is constant voltage charge, and thus an actual current value varies as indicated by the dashed line.
  • a gap between the estimated value, i.e., the actually measured value, and the actually measured value indicated by the densely dashed line is large. Further, errors as indicated by the loosely dashed line are large.
  • a gap between the estimated value, i.e., the actually measured value, and the actually measured value indicated by the densely dashed line is small in comparison with FIG 10 . Further, errors as indicated by the loosely dashed line are small.
  • occurrence of errors in estimation of temperature can be reduced by correcting the value of ⁇ in a case where the voltage is less than the threshold value Th1 during discharge or in a case where the voltage is larger than the threshold value Th2 during charge.
  • the estimated temperature value is supplied to an ECU, and the ECU executes processing such as temperature correction on a state of charge, based on the estimated temperature value.
  • the chargeable battery temperature estimation apparatus 1 may estimate a state of charge, based on the estimated temperature value.
  • the ECU may calculate, other than the SOC, index value (for example, a state of function (SOF) or an SOH) indicating a state of the chargeable battery 14, based on the estimated temperature value.
  • an operation state of the vehicle may be controlled, based on these calculated index values. For example, in a case of using the SOC, the chargeable battery 14 can be charged, with the ECU controlling the alternator 15.
  • the SOF may be used to determine whether or not the engine 16 can be restarted after execution of so-called no idling, which is operation of stopping the engine 16 when the vehicle stops at a red light, for example, and, depending on results of the determination, the engine 16 may be stopped.
  • no idling is operation of stopping the engine 16 when the vehicle stops at a red light, for example, and, depending on results of the determination, the engine 16 may be stopped.
  • index values indicating a state of the chargeable battery such as SOC, SOF, and SOH
  • SOC state of the chargeable battery
  • expression (8) and expression (9) described above include SOH as a variable, however, these expressions may be expressions not including SOH, that is, expressions including variables of a voltage V and a current I.

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EP18896141.1A 2017-12-27 2018-12-26 Vorrichtung zur abschätzung der temperatur einer wiederaufladbaren batterie und verfahren zur abschätzung der temperatur einer wiederaufladbaren batterie Withdrawn EP3726639A4 (de)

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JP4383596B2 (ja) 1999-09-06 2009-12-16 トヨタ自動車株式会社 電池の内部温度検出装置
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FR2974922B1 (fr) * 2011-05-04 2013-04-26 IFP Energies Nouvelles Procede optimise de gestion thermique d'un systeme electrochimique de stockage
JP2013143308A (ja) * 2012-01-12 2013-07-22 Nissan Motor Co Ltd 電池温度推定装置
AU2013376245B2 (en) * 2013-01-30 2016-03-31 Mitsubishi Electric Corporation Battery monitoring device, power storage system, and control system
JP6163879B2 (ja) * 2013-05-29 2017-07-19 日産自動車株式会社 電池温度推定装置及び電池温度推定方法
JP6200359B2 (ja) * 2014-03-20 2017-09-20 古河電気工業株式会社 二次電池内部温度推定装置および二次電池内部温度推定方法
JP6739946B2 (ja) 2016-02-29 2020-08-12 ニッポン高度紙工業株式会社 アルカリ電池用セパレータ及びアルカリ電池
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US11754631B2 (en) 2023-09-12
EP3726639A4 (de) 2021-01-27
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US20200328481A1 (en) 2020-10-15
CN111433969B (zh) 2023-09-15

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